tcp: add stat of data packet reordering events

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Introduce a new TCP stats to record the number of reordering events seen
and expose it in both tcp_info (TCP_INFO) and opt_stats
(SOF_TIMESTAMPING_OPT_STATS).
Application can use this stats to track the frequency of the reordering
events in addition to the existing reordering stats which tracks the
magnitude of the latest reordering event.

Note: this new stats tracks reordering events triggered by ACKs, which
could often be fewer than the actual number of packets being delivered
out-of-order.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Wei Wang 2018-07-31 17:46:24 -07:00 • committed by David S. Miller

parent 7e10b6554f

commit 7ec65372ca

5 changed files with 11 additions and 4 deletions

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4

include/linux/tcp.h

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2

include/uapi/linux/tcp.h

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4

net/ipv4/tcp.c

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3

net/ipv4/tcp_input.c

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2

net/ipv4/tcp_recovery.c

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